1 // SPDX-License-Identifier: GPL-2.0-only
3  * DMA Router driver for LPC18xx/43xx DMA MUX
7  * Based on TI DMA Crossbar driver by:
8  *   Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
46 	spin_lock_irqsave(&dmamux->lock, flags);  in lpc18xx_dmamux_free()
47 	mux->busy = false;  in lpc18xx_dmamux_free()
48 	spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_free()
54 	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);  in lpc18xx_dmamux_reserve()
59 	if (dma_spec->args_count != 3) {  in lpc18xx_dmamux_reserve()
60 		dev_err(&pdev->dev, "invalid number of dma mux args\n");  in lpc18xx_dmamux_reserve()
61 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
64 	mux = dma_spec->args[0];  in lpc18xx_dmamux_reserve()
65 	if (mux >= dmamux->dma_master_requests) {  in lpc18xx_dmamux_reserve()
66 		dev_err(&pdev->dev, "invalid mux number: %d\n",  in lpc18xx_dmamux_reserve()
67 			dma_spec->args[0]);  in lpc18xx_dmamux_reserve()
68 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
71 	if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) {  in lpc18xx_dmamux_reserve()
72 		dev_err(&pdev->dev, "invalid dma mux value: %d\n",  in lpc18xx_dmamux_reserve()
73 			dma_spec->args[1]);  in lpc18xx_dmamux_reserve()
74 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
78 	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);  in lpc18xx_dmamux_reserve()
79 	if (!dma_spec->np) {  in lpc18xx_dmamux_reserve()
80 		dev_err(&pdev->dev, "can't get dma master\n");  in lpc18xx_dmamux_reserve()
81 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
84 	spin_lock_irqsave(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
85 	if (dmamux->muxes[mux].busy) {  in lpc18xx_dmamux_reserve()
86 		spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
87 		dev_err(&pdev->dev, "dma request %u busy with %u.%u\n",  in lpc18xx_dmamux_reserve()
88 			mux, mux, dmamux->muxes[mux].value);  in lpc18xx_dmamux_reserve()
89 		of_node_put(dma_spec->np);  in lpc18xx_dmamux_reserve()
90 		return ERR_PTR(-EBUSY);  in lpc18xx_dmamux_reserve()
93 	dmamux->muxes[mux].busy = true;  in lpc18xx_dmamux_reserve()
94 	dmamux->muxes[mux].value = dma_spec->args[1];  in lpc18xx_dmamux_reserve()
96 	regmap_update_bits(dmamux->reg, LPC18XX_CREG_DMAMUX,  in lpc18xx_dmamux_reserve()
98 			   LPC18XX_DMAMUX_VAL(dmamux->muxes[mux].value, mux));  in lpc18xx_dmamux_reserve()
99 	spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
101 	dma_spec->args[1] = dma_spec->args[2];  in lpc18xx_dmamux_reserve()
102 	dma_spec->args_count = 2;  in lpc18xx_dmamux_reserve()
104 	dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux,  in lpc18xx_dmamux_reserve()
105 		dmamux->muxes[mux].value, mux);  in lpc18xx_dmamux_reserve()
107 	return &dmamux->muxes[mux];  in lpc18xx_dmamux_reserve()
112 	struct device_node *dma_np, *np = pdev->dev.of_node;  in lpc18xx_dmamux_probe()
116 	dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);  in lpc18xx_dmamux_probe()
118 		return -ENOMEM;  in lpc18xx_dmamux_probe()
120 	dmamux->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");  in lpc18xx_dmamux_probe()
121 	if (IS_ERR(dmamux->reg)) {  in lpc18xx_dmamux_probe()
122 		dev_err(&pdev->dev, "syscon lookup failed\n");  in lpc18xx_dmamux_probe()
123 		return PTR_ERR(dmamux->reg);  in lpc18xx_dmamux_probe()
126 	ret = of_property_read_u32(np, "dma-requests",  in lpc18xx_dmamux_probe()
127 				   &dmamux->dma_mux_requests);  in lpc18xx_dmamux_probe()
129 		dev_err(&pdev->dev, "missing dma-requests property\n");  in lpc18xx_dmamux_probe()
133 	dma_np = of_parse_phandle(np, "dma-masters", 0);  in lpc18xx_dmamux_probe()
135 		dev_err(&pdev->dev, "can't get dma master\n");  in lpc18xx_dmamux_probe()
136 		return -ENODEV;  in lpc18xx_dmamux_probe()
139 	ret = of_property_read_u32(dma_np, "dma-requests",  in lpc18xx_dmamux_probe()
140 				   &dmamux->dma_master_requests);  in lpc18xx_dmamux_probe()
143 		dev_err(&pdev->dev, "missing master dma-requests property\n");  in lpc18xx_dmamux_probe()
147 	dmamux->muxes = devm_kcalloc(&pdev->dev, dmamux->dma_master_requests,  in lpc18xx_dmamux_probe()
150 	if (!dmamux->muxes)  in lpc18xx_dmamux_probe()
151 		return -ENOMEM;  in lpc18xx_dmamux_probe()
153 	spin_lock_init(&dmamux->lock);  in lpc18xx_dmamux_probe()
155 	dmamux->dmarouter.dev = &pdev->dev;  in lpc18xx_dmamux_probe()
156 	dmamux->dmarouter.route_free = lpc18xx_dmamux_free;  in lpc18xx_dmamux_probe()
159 				      &dmamux->dmarouter);  in lpc18xx_dmamux_probe()
163 	{ .compatible = "nxp,lpc1850-dmamux" },
170 		.name = "lpc18xx-dmamux",